[8u60] approval request for 8068587: ScriptEngineFactory.getParameter() should specify NPE for a null key

[A. Sundararajan]

Please approve.

Bug: https://bugs.openjdk.java.net/browse/JDK-8068587
jdk9 review thread: 
http://mail.openjdk.java.net/pipermail/core-libs-dev/2015-February/031333.html
jdk8u-dev webrev: http://cr.openjdk.java.net/~sundar/8068587/8u60/webrev.00/

Thanks,
-Sundar